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Note Allowance for loan losses (Troubled debt restructuring according to their accruing status) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 119,670 | $ 109,091
Commercial |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 52,190 | 36,982
Construction |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 56 | 0
Mortgages |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 41,211 | 48,832
Leasing |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 320 | 475
Consumer |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 25,893 | 22,802
Non Covered Loans |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 1,515,889 | 1,258,327
Non Covered Loans | TDR |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 112,999 | 104,581
Non Covered Loans | Commercial |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 360,679 | 220,846
Non Covered Loans | Commercial | TDR |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 46,889 | 32,472
Non Covered Loans | Construction |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 1,788 | 0
Non Covered Loans | Construction | TDR |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 56 | 0
Non Covered Loans | Mortgages |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 1,042,470 | 930,076
Non Covered Loans | Mortgages | TDR |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 41,211 | 48,832
Non Covered Loans | Leasing |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 1,108 | 1,256
Non Covered Loans | Leasing | TDR |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 320 | 475
Non Covered Loans | Consumer |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 109,844 | 106,149
Non Covered Loans | Consumer | TDR |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 24,523 | 22,802
Covered loans |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 0 | 5,885
Covered loans | TDR |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0
Covered loans | Mortgages |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 0 | 5,885
Covered loans | Mortgages | TDR |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0
Non-Accruing | Non Covered Loans |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 284,558 | 199,050
Non-Accruing | Non Covered Loans | Commercial |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 130,921 | 59,626
Non-Accruing | Non Covered Loans | Construction |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 1,788 | 0
Non-Accruing | Non Covered Loans | Mortgages |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 135,758 | 126,798
Non-Accruing | Non Covered Loans | Leasing |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 440 | 393
Non-Accruing | Non Covered Loans | Consumer |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 15,651 | 12,233
Non-Accruing | Covered loans |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 0 | 3,227
Non-Accruing | Covered loans | Mortgages |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 0 | 3,227
Accruing | Non Covered Loans |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 1,231,331 | 1,059,277
Accruing | Non Covered Loans | Commercial |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 229,758 | 161,220
Accruing | Non Covered Loans | Construction |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 0 | 0
Accruing | Non Covered Loans | Mortgages |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 906,712 | 803,278
Accruing | Non Covered Loans | Leasing |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 668 | 863
Accruing | Non Covered Loans | Consumer |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 94,193 | 93,916
Accruing | Covered loans |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | 0 | 2,658
Accruing | Covered loans | Mortgages |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |
Troubled debt restructurings | $ 0 | $ 2,658

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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